Bobbin



E. l. HUBBARD.

BOBBIN.

APPLICATION FILED rEs.21; 1919.

1,388,95 1f Patented Aug. 30, 1921.

UNITED STATES EBEE J. IIUBBARD, oF BERWYM ILLINOIS.

BOBB'IN.

Specification of Letters Patent.

Patented AugQSO, 1921.

Application led yl'e'emuary 21,` 1919. Serial No. 278,534.

To all whom t may cof/wem Be it known that I, EBER J. I-IUBBARD, a citizen of the United States, and a resident of Berwyn, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Bobbins, of which the following is a specification.

My invention relates to bobbins, and particularly to so-called mule bobbins for mule shuttles of weaving machines.

These mule bobbins comprise a base part and a shank part, the base part serving to center and hold the bobbin within the shuttle and the shank part supporting the yarn or thread to be fed out during operation of the shuttle. Heretofore these bobbins have beenconstructed entirely of wood. As the cost of wood has now considerably increased, the cost of manufacturing wooden bobbins is now correspondingly high. Furthermore the wooden bobbins are easily chipped and split, and will readily burn. Another disadvantage is their limited capacity. The shuttle affords only limited spa-ce for the bobbin and as a Wooden bobbin must have suliiciently thick walls to give the necessary strength, the yarn or thread supporting space is materially limited.

The object of my invention is to overcome the disadvantages of the wooden bobbin by using sheet metal, preferably steel. The base and shank parts of the bobbin being cylindrical, thin sheet steel when bent to form these parts will give great strength. This great strength of the steel over that of wood will of itself permit the diameter of the shank to be materially reduced, and the thinness of the steel wall gives a further reduction of the external diameter, the result being that the thread or yarn capacity is greatly increased oven. the spacekavailable on wooden bobbins. Furthermore the steel bobbin is ireproof, will not chip norY split, and can be more cheaply constructedthan the wooden bobbin.

The various features of my invention are clearly shown on the accompanying drawing, in which- Figure 1 is a side elevational view of a bobbin.

Fig. 2 is a sectional view on plane 2-2 of Fig. 1.

Fig. 3 isla plan viewV of the base part.

Fig. 4 is a sectional view on plane 4 4 of Fig. 2. i Y

bin is preferably deriected inwardly to form Ythe radial ange 12, which forms a smooth seat for the bobbin and gives a finished appearance. Intermediate lits top and base flange the body part has the peripheral groove 13 for receiving the shuttle 'clamping members (not shown) for holding the bobbin in proper position in the shuttle.

The shank S of thebobbin is formed from a flat blank of sheet metal by rolling around a mandrel. The shank is of circular cross section throughout, but tapers gradually from base to tip. Tongues 14 on one of the edges Vof the blank engage under the opposite edge when the shank is formed, and these tongues serve to hold the edges in proper alinement and may be spot-welded in place to lock the edges firmly together. In order to strengthen and stiften the shank as well as to provide barriers or retarder projections for the yarn or thread, annular corrugations or ridges 15-are provided, the shank blank bein'g preferably first corrugated transversely before bending to form the shank. In orderV to rigidly secure the shank `to the body part, tongues 16 are formed at the base end of the shank, which extends through notches 17 cut in the edge surrounding the opening 11 of the base, the tongues after engaging in the slots being deflected over against the inside of the top 10 and preferably spot-welded thereto. The diameter of the opening 11 is preferably equal to the inner diameter of the shank at its base so that when the tongues 16 are secured the shank will be securely locked in abutting engagement against thebody part. I thus produce a very strong, light and eiiicient bobbin of sheet metal `whose capacity greatly exceeds that of the old style wooden bobbin. The annular corrugations on the shank greatly strengthen and stifen the shank, and at the same time serve to hold the thread or yarn securely on the shank.

The body part is also greatly strengthenedV by its flange l2 and the internal ridge which forms the notch for receiving the clamping devices Within the shuttle. lVlien theV bobbin is to be rewound it is slipped overtasuitable spindle in the same manner as is the wooden bobbin. f

s changes and modifications Will no doubt be made, I do not desire to be limited except as pointed out in the appended claim.

Having described as follows:

bobbin comprising a cylindrical base part stamped integral from sheet metal and having a large opening in its base and a sinaller'opening in its top Wall, a shank formed of a single piece of metal bent into my invention, I claim `conical ferm With its edges intimately `abutting along their entire length, tongues eX- 2 tending from one ,ofsaid edges and the othe'i'" edge haviii-`- depressions for receiving Y ysaid tongues, said tongues being spot-Welded 

